Banerjee, S K and Narayanan, P I A (1955) Beneficiation of low-grade Manganese ore from Marivalasa, Salur, Srikakulam District. Other (TMP). CSIR-NML, Jamshedpur, Jamshedpur.
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A low grade manganese ore assaying 28.63% Mn,12.68% Fe, 18.44% SiO2, 6.19% Al2O3 and 0.2% P was received from Marivalasa, Salur, Srikakulam district. The manganese minerals were oxide viz. psilomelane and pyrolusite with quartz, garnet and limonite (ochre) as the principal gangue minerals. Gravity separation or straight magnetic separation did not produce satisfactory grade of manganese concentrates. Reduction roast of the -4 mesh ore after attrition grinding to eliminate the soft ochre, followed by magnetic separation yielded a manganese concentrate assaying 47.1% Mn with a Mn/Fe ratio of 6.9 and with a recovery of 64.2%. Reduction of the -4+35 by magnetic separation at -20 mesh yielded manganese concentrates assaying from 50.10% Mn to 48.18% % Mn with recoveries varying from 47.7% to 71.6% Mn and with Mn:Fe ratios between 7.9:1 to 5.5:1. Phosphorus in the concentrate was over 0.21% which was even slightly higher than that in the original ore and hence the concentrate might require blending with other ores for production of ferro-manganese.
|Item Type:||Project Reports (Other (TMP))|
|Uncontrolled Keywords:||Low-grade manganese ore, ferro-manganese, magnetic separation, gravity separation, garnet, limonite, psilomelane and pyrolusite|
|Divisions:||Information Management and Dissemination Centre|
|Deposited By:||Dr Mita Tarafder|
|Deposited On:||04 Jul 2022 12:58|
|Last Modified:||04 Jul 2022 12:58|
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